Printing-surface.



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Patented August 25, 19cc.

PATENT OFFICE.

GEORGE SMITH CHRISTIE, or NOTTINGHAM, ENGLAND.

PRINTING-SURFACE.

SPECIFICATION forming part of Letters Patent No. 736,937, dated August 25, 1909;.

Application filed October 7,1902.

To all whom it may concern:

Be it known that I, GEORGE SMITH OIIRIsTIE, a subject of the King of Great Britain and Ireland, residing at Nottingham, England, have invented new and useful Improvements in Printing-Surfaces, of which the following is a specification.

This invention relates to the manufacture or production of a new or improved artificial printing surface resembling lithographic stone and designed to be used as a substitute therefor. To this end I prepare a composition from the ingredients hereinafter mentioned and apply the same when in a plastic condition to a length or sheet of appropriate textile material, which thus forms a backing therefor, and which composition after being dried to harden it enables me to produce a' printing-surface of a flexible or pliable nature and of any suitable length and thickness or in the form of a Web. On this surface, which may be smooth or grained, as required, the design, plan, pattern, or the like is drawn in the usual way and by the usual means as now practiced by lithographic artists.

I proceed by first forming a mixture of the following ingredients and in or about the following proportions-viz., chlorate of magnesia, ten parts, by weight; borate of potassium, one hundred parts, by weight; glycerin, ten parts, by weight, and dissolve the same in ten parts of water, so as to bring said mixture to the consistency of a stiff paste. This forms a vehicle with which there is then incorporated the undermentioned ingredients and v in or about the following proportionsviz.,

chalk, fifteen parts, by weight; carbonate of calcium, fifteen parts, by weight; carbonate of potassium, fifteen parts, by weight; borate of manganese, three parts, by weight; burnt sienna, three parts, by weight; oxalic acid, two parts, by weight, and hydrate of lime, one part, by weight. The purpose of forming this vehicle from the mixture first mentioned is to enable the subsequent ingredients just stated to amalgamate therewith, which they would not otherwise do if all the ingredients composing both mixtures were added together simultaneously. The combined mixture is then intimately mixed and is afterward ground until it assumes aplastic consistency, when it is finally forced through a fine sieve.

Serial No. 126,345. (No model.)

The composition thus prepared is spread evenly by any suitable means and to the required thicknesssay, the one-twentieth of an inch-onto a backing or sheet of textile material-J01 example, canvas having a somewhat coarse mesh-and is then placed in a heating-chamber and dried at a temperature of about to oentigrade for about thirty hours. After drying the surface is carefully smoothed down or otherwise suitably treated to render it fit for drawing or Writing upon or to receive a transfer, and it can then be used in lithographic-printing presses in the usual way. In this manner I am enabled to produce a printing-surface for use in lithography of various lengths and thickness or in the form of a web, as may be required, and which surface will be found to possess sufficient hardness for printing purposes while at the same time it is rendered flexible or pliable to permit of it being cut up and applied to the cylinders of printing-machines or to be mounted on rollers or to be used in a flat state.

For printing repeats -say for wall-papersthe material is used in lengths of about twelve feet or it maybe in the form of a Web. In this latter case I find it advantageous to mount it on rollers or drums, one (or more) of which is (or are) provided with any known appropriate means to keep said web properly stretched while passing around the printingcylinder. Owing to the pliable or flexible nature of the material I am enabled to produce the design, plan, pattern, or the like upon the surface thereof while in a flat condition and then apply said material to the printing-cylinder without fear of distorting the work.

Having now described my invention, what I claim, and desire to secure by Letters Patent, is- 1 1. A pliable and flexible artificial printingsurface for use in lithography, consisting of chlorate of magnesia, borate of potassium, glycerin, Water, chalk, carbonate of calcium, carbonate of potassium, borate of manganese, burnt sienna, oxalic acid, hydrate of lime, and a backing of textile fabric.

2. A pliable and flexible artificial printingsurface for use in lithography, consisting of a mixture of: chlorate of magnesia, ten parts by weight, borate of potassium, one hundred scribed, consisting of a mixture of the following ingredients by parts in weight: ten parts chlorate of magnesia, one hundred parts borate of potassium, ten parts glycerin,-ten

parts water, and the addition thereto of the further ingredients by parts in weight, viz: fifteen parts chalk, fifteen parts carbonate of calcium, fifteen parts carbonate of potassium, three parts borate of manganese, three parts burnt sienna, two parts oxalic acid, and one part hydrate of lime, and a backing of textile fabric.

4. The process of producing af pri ntingsurface of the character described, consisting in first forming a stiff paste of ten parts chlorate of magnesia, one hundred parts borate of potassium, ten parts of glycerin and ten parts of water, all by weight, then incorporating therewith fifteen parts chalk, fifteen parts carbonate of calcium, fifteen parts carbonate of potassium, three parts borate of manganese,

three parts burnt sienna, two parts oxalic acid and one part hydrate of lime, also by weight, to form a plastic mass, passing said mass through a sieve, spreading it onto a backing of coarse canvas and drying the same.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

GEORGE SMITH CHRISTIE.

Witnesses:

EDWARD D. IIEARN,

THOS. H. 000K. 

